Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17036s&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
A 30 ks Chandra ACIS-I observation of Kes 79 (G33.6+0.1) provides new insights into this SNR. Spectra from different regions are fitted with several models and results strongly favor an NEI model. This implies underionized states of plasma in Kes 79, which is also indicated by the measured centroids of Mg, Si and S Heα lines. The temperatures in different regions are remarkably similar, around 0.6 keV. The narrow band images of Mg, Si and S also show little difference from one another. A partial shell-like structure is seen between the previously known bright inner and faint outer shells. This might indicate another shell or a projection effect. The X-ray outer shell follows the radio shell very well, including two filamentary structures in the east and a protrusion in the northeast. The thermal structure and evolution of Kes 79 are discussed as well as possibilities for multi-shell structure.
Seward Frederick
Slane Patrick
Smith Randall
Sun Ming
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